CN1111252A - Monovinyl aromatic compounds having improved abrasion resistance - Google Patents
Monovinyl aromatic compounds having improved abrasion resistance Download PDFInfo
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- CN1111252A CN1111252A CN95100291A CN95100291A CN1111252A CN 1111252 A CN1111252 A CN 1111252A CN 95100291 A CN95100291 A CN 95100291A CN 95100291 A CN95100291 A CN 95100291A CN 1111252 A CN1111252 A CN 1111252A
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- wax
- molecular weight
- polystyrene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08L91/06—Waxes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Lubricants (AREA)
- Silicon Polymers (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention provides the method and apparatus for improving the qualities of monovinyl aromatic compounds, and more particularly for improving abrasion resistance and reducing the coefficient of friction. The method ncludes addition of a well-defined low-molecular weight polyolefin friction-reducing material to the compounds.
Description
The present invention relates to have low frictional properties, wear resistance, be used for the preparation of the monovinyl aromatic compounds of video-tape shell and cassette for recording tape, beverage cup and this series products of food container.This monovinyl aromatic compounds the has comprised fusion High Impact Polystyrene (HIPS) of High molecular weight polyethylene wax.
The video-tape shell is made by different materials usually.A kind of employing in this class material is added with the high impact polystyrene of silicone oil.This material is characterised in that low friction and high impact properties, but because the potential problems that in the course of processing, cause, can it exists received problem in industry.The content that an example of this class material is poly-(dimethyl siloxane) is the material that is at most 2000ppm.
The another kind that this generic request has the material of low friction and high-wearing feature is the material that is dispersed with unknown component small-particle or " hole " in polystyrene substrate.From the fusing point analysis as can be known, this component is 800 the low-molecular-weight wax that the Mn molecular weight is lower than.The content of lower-molecular-weight component is about 1% weight in this material.
Main judging criterion to the material that is used to make tape drum shell and computer disks is that this material presents low frictional coefficient (COF).
Usually be used as for example computer format floppy of video cassette shell and other aspects, the cassette for recording tape shell, subject matter of the material of beverage cup and food container aspect is that they are in use wear-resisting inadequately, is not enough to prevent surfacing " airborne dust ".This " airborne dust " generates the superfine particle that is called " particulate ", and when the situation of tape drum, they enter in the electronics, make recording-playing head Bian Dirty, and cause the problem on other electronics.In the past, a kind of method that addresses this problem is to use for example acronitrile-butadiene-styrene (ABS) multipolymer of expensive material.Use very inexpensive materials for example the attempt of polystyrene failed because opposite, use polystyrene to be difficult to obtain low-friction coefficient and high-wearing feature with ABS.
When the situation of beverage cup and food container, " dirt " that produces in manufacturing processed and " hair " cause " the aesthstic pollution " of container contents really though be chemically inert and nontoxic, cause the human consumer dissatisfied to these products.
This shows, the key that solves tape drum wear problem and capsule contamination is to leave injection molding and when it is sent to fabrication line when container, prevent that material is worn, by the mono-vinyl compound of modified rubber for example High Impact Polystyrene (HIPS) (IPS) make for example food product containers of parts with injection moulding usually, tape drum shell and floppy disk, therein, molten polymer is injected under pressure in the water-cooled mould, generates parts.Under about 220-240 ℃ temperature, melts is injected in the mould, is chilled to about 100 ℃ then, so that the parts that are molded into solidify.Afterwards the parts that are molded into are taken out from mould, and be put on the travelling belt.When parts were chilled to room temperature by 100 ℃, it was easy to wear especially, generated particulate.Concerning common used material, still melt in the parts that are being molded in the time of 100 ℃ because be used for obtaining wax and the oil of low COF, thereby not wear-resistant, and when object is subjected to frictional force, have the surface of a little gluing or glue.
Therefore need low friction, wear-resistant polymer materials is used for making beverage cup, food product containers, the box of video-tape or audiotape or shell, compacting dish and computer disks, this material should have outside low-friction coefficient and the high-wearing feature, also should have good elasticity and toughness, to prevent gentle fracture when bent.Important perhaps crucial be that this material must be successfully wear-resistant when about 100 ℃ of high injection temperatures.In addition, be included in room temperature even at refrigerator and refrigerator temps at low temperature, this material also should show good " smooth property " and anti-" airborne dust " property.
Make food product containers, the usual method of tape drum shell and computer format floppy is included in the method described in the belgian patent the 816985th, the latter proposed to use molecular weight (Mw) as between the 2000-12000, fusing point (MP) is 82-98 ℃ wax.United States Patent (USP) 4,961,800 have disclosed in plastic window and to use wax as anti-fog additive.U.S.2,681,323 have proposed use wax for example beeswax, brazil wax and BE Square(solid paraffin) make the method for the lower disc of COF, and the MP of these waxes is lower than about 90 ℃, and Mw is less than 1000.U.S.3,876,645 propose to use long chain fatty acids amides and epoxyethane derivative as static inhibitor.Thereby, use wax not inform that as the common manufacturing of COF improving agent use can wear-resistant wax in 100 ℃ of temperature ranges.These common method for makings even do not propose at the wear problem that is higher than under the envrionment temperature.
People also find, by adding wax class additive to attempt to improve the common method for making of polymkeric substance COF, have adopted additive, and the latter is dissolved fine in rubber and/or polystyrene, thereby can not exist from particle by composition in polymeric matrix.Therefore their lubrication is weakened or be eliminated because they are dissolved in one or another kind of polymeric constituent.The invention provides a kind of cheapness based on the monovinyl aromatic material, the latter has at high temperature shown desirable frictional coefficient and high-wearing feature, and good intensity and toughness.
The present invention discloses a kind of wear-resistant monovinyl aromatic material of low friction with high impact properties, it is specially adapted to make beverage cup, food product containers, tape drum shell and computer format floppy, this monovinyl aromatic material is a kind of high impact-resistant polymkeric substance, the latter has rubber particles giving resistance to impact shock, and it also has a large amount of High molecular weight polyethylene waxes (its scope is Mn=1000～7000) so that very low frictional coefficient to be provided, and also anti-material here is worn down to and is particulate.The melting temperature of selected special wax (MP) is higher than about 90 ℃, preferably exceeds about 100 ℃.
Description of preferred embodiments
According to the present invention, disclose in the present invention and be beneficial to a kind of low friction of manufacturing especially, wear-resistant monovinyl aromatic material is the sort of of so-called High Impact Polystyrene (HIPS) or IPS.Common IPS material, although have enough toughness and intensity with as for example beverage cup, the manufactured materials of tape drum shell and this class of floppy disk, unfortunate thing, its shown resistance to abrasion is too low, to such an extent as to can not be successfully used in this series products.Therefore, by in this class material, adding emollient component (it comprises High molecular weight polyethylene wax), the present invention has obtained to have the oilness that high-wearing feature becomes reconciled in 100 ℃ of scopes anti-impact goes out polystyrene material, and this material has successfully replaced for example ABS of expensive more material.
Monovinyl aromatic material of the present invention is preferably the polystyrene type material and comprises alpha-methyl styrene, p-methylstyrene, and other ring substituted phenylethylenes.In preferred concrete an enforcement, produced a kind of polystyrene material according to the present invention, obtain the utmost point and be applicable to special purpose, extremely durable, low friction, the high-wearing feature polymkeric substance of being planned.Have found that although utilize Microcrystalline Wax (being that molecular weight is less than 800) to make above-mentioned general purpose material obtain low-friction coefficient, the trouble of these materials is, in the lower molecular weight Microcrystalline Wax shift-in rubber grain, therefore makes their effectiveness forfeiture in IPS.On the other hand, the inventor finds, by using melting temperature (MP) to be higher than about 100 ℃, molecular weight is about 1000～7000 polyethylene wax, causing the polyethylene particles in the IPS substrate material is a kind of solid under injection temperature, and in the not obvious shift-in rubber grain of this particle, so it exists with particle shape in the polystyrene substrate of IPS material.Consequently, to intersperse among in the polystyrene substrate and the polyethylene particle that exists in the IPS material, particularly is being chilled to this critical stage of envrionment temperature by being injected into, play a part to provide oilness and resistance to abrasion.
In following table, contain the different samples of the IPS of dissimilar waxes, assessed with common shock resistance and glossiness and COF and airborne dust characteristic.These samples are to use twin screw extruder, and IPS material and polyethylene wax fusion fusion are made.With their friction or relative frictions and rub toward each other on fabrication line of hot-moulded article imitations, with the mensuration airborne dust with travelling belt.
The table I
A 1.5 850 103 5.5 1.5 78 5.1 58 0.32 is medium
B 1.5 850 103 5.7 1.6 88 5.4 80 0.29 is serious
C 1.5 850 103 2.5--5.7-0.25 is medium
D 1.0 2,000 126 4.0 1.3 72 4.3 78 0.17 is slight
E 1.5 2,000 126 4.0 1.3 68 4.5 79 0.19 is very light
F 1.0 3,000 133 4.0 1.3 69 4.4 81 0.19 is very light
G 1.5 3,000 133 4.0 1.0 66 5.0 82 0.16 does not have
H 1.0 HOPE 134 4.0 1.0 71 4.5 81 0.24 do not have
Measure each performance by following method:
Molecular weight (Mn) vapor-pressure osmometry
Fusing point (MP) ASTM D-127
Izod test ASTM D-256
Drop-dart impact test ASTM D-3029
Melt index (MFI) ASTM D-1238 FR-A
Gloss ASTM D-528
Frictional coefficient (COF) ASTM D-1894
From then on table can be seen the influence of different wax to the airborne dust under the injection temperature, and different wax is to frictional coefficient, the influence of glossiness and resistance to impact shock.In sample A-C, low-molecular-weight wax (Mw=850) has been obtained the glossiness that is higher than mean value and good shock resistance characteristic, and COF and airborne dust are very poor.The perspective electron microscope of these samples (TEM) analysis revealed does not have isolating Wax particles in matrix.It is believed that all these low Mw waxes are all diffused in the rubber grain and/or are dissolved in the polystyrene substrate.
Yet in case the molecular weight of wax reaches 2000, COF and airborne dust are promptly obviously improved.The tem analysis of sample D and E shows, forms and be dispersed with the small-particle of PE wax everywhere at polystyrene substrate.Sample F and G show that the preferred molecular weight of PE is about 3000 scope, and MP is 133 ℃.Best result has been given in sample G demonstration, and COF is very low value, is 0.16, and report produces airborne dust.It is 3000 PE wax that sample G has utilized the molecular weight of 1.5% weight.It contains acceptable shock resistance and MFI except glossiness and COF, and airborne dust does not does not wear and tear.As a comparison, add high density polyethylene(HDPE) (HDPE) in the used IPS of embodiment G making sample H, and measure its performance.The COF performance of gained can not be accepted, although airborne dust and not obvious.
People think that from the result of physical parameter and tem analysis in the IPS material, at least two factor affecting needed low COF and optimum resistance to abrasion.These factors are: insoluble (this show as molecular weight dependence) of slip additive in polystyrene and rubber, and the fusing point of slip additive (MP) rank.By selecting for example PE wax of the preferred Mw in Mw＞1000＞2000 of lubricant, the separating particles of lubricant has appearred in the matrix of final resulting IPS goods.These separating particles cause the low COF of goods.
Equally, by select its fusing point greater than the injection temperature that is run into promptly greater than 105 ℃ lubricant additive, then when it leaves mould, promptly obtained the IPS material of wear-resistant and low friction.With regard to airborne dust and wearing and tearing, because the period that the critical period of molded IPS material is them after just having left mould, the invention provides utilization crystalline wax and optimize the manufacture method of " smooth property " and minimizing dust and particulate when being higher than calcining temperature.
Although the preferred molecular weight range of polyethylene wax additive is 1000～3000, most preferred concrete enforcement is to contain the IPS material that molecular weight is about 3000 polyethylene wax about 1.5%.As shown in table 1, this material (sample G) also shows good glossiness and acceptable shock resistance and melt flowability.All these samples are desirable to Production Example such as tape drum and these article of floppy disk.
Should be noted that wearing test is performed such in the example shown in the table 1: with the net grain surface of these materials, with constant speed and constant downward force, friction each other, the particulate on detect by an unaided eye then this sample and the net grain surface.
Below the table II show another general picture of the present invention, this relates to us and thinks the obvious various parameters of improving resistance to abrasion and reducing airborne dust.We have investigated a kind of like this effect in the table II: the penetration number of special polyethylene wax has improved the desired properties of IPS material.This investigation is performed such: select all to meet the various PE waxes of listed each the required standard of table I, these standards are that the Mn molecular weight is 1000 or higher, and fusing point is 105 ℃ or higher.PE wax in these kinds should select its penetration number to be at most 3 (measured as pressing ASTM D-1321) less than 0.1.These results are tangible in the table II.
The table II
Polyethylene wax and contain the performance of this wax
The table II
M.P. ℃ of penetration degree of PE wax molecular weight, 25 ℃ of COF wearing and tearing/airborne dusts
Mn Mw [0.1mm of unit]
A ASTM?D-1321
850 107 (103) 2.0 0.25-are medium/and heavy
0.35
B 2000-126 (126) 0.5 0.17-are very light/and light
(2070) (2420) 0.19
C 3,000 129 (133) 0.5 0.16-do not have/and very light
(3390) (12950) 0.19
D 1,700 4,000 106 (105) 3--and light
(2500) (4100)
E 2,800 6,500 120 (123)＜0.1--do not have/very light
(3300) (6000)
F 7,700 35, and 000 104 (100) 3--medium
(7800) (30,900)
Value in () GPC(gel permeation chromatography) or DSC(difference look scanning calorimetry) record.
Penetration degree: press ASTM D-1321-76(77)
In this table, people as can be seen, molecular weight of wax (Mn) and fusing point, although to determining that successful IPS material is necessary, they may be inadequate complete qualification.PE wax A for example, it is 2～3 that D and F have all recorded its penetration number, is molecular weight and fusing point though these PE waxes meet other two standards, the IPS sample that these waxes are made shows tangible and unacceptable wearing and tearing/airborne dust.
On the other hand, being lower than about 1(by penetration number is wax B, C and E) the IPS sample made of PE wax do not have wearing and tearing/airborne dust significantly.Therefore as can be seen, except molecular weight and fusing point, the penetration number of PE wax has tangible contact to the resistance to abrasion/anti-airborne dust of final IPS product.
Here disclosed IPS material adopts and the component of doing is carried out " doing fusion " or mix and make in twin screw extruder (2 ", 50: 1 L/D).With ball shape or granulous IPS material and the fusion of polyethylene wax-wrapped pill, the twin screw extruder that passes through with this dried fusion carries out the fusion fusion then.
The additive method of making IPS/PE wax product is included in and in the IPS polymerization process PE wax is added to institute and add in the streams; In the liquid stream of the below of the phase transition point that PE wax is directly added to the IPS reactor.
Though be described in the superincumbent specific descriptions in concrete preferred enforcement the of the present invention, but the intention of this description does not lie in the special shape that limits the invention to disclosed concrete enforcement here because they be confirmed to be illustrative rather than restrictive.The personnel that art technology is skilled will know that the present invention is not so confined.For example, because The present invention be directed to High Impact Polystyrene (HIPS), very clear, use the method comprised here, the personnel that art technology is skilled also can use other mono-vinyl aromatic polymers, and for example alpha-methyl styrene or p-methylstyrene are put into practice the present invention.Here do not disclose than polyethylene PE and than wax same handy other low-molecular weight polymers or wax.But the present invention statement can cover any changes and improvements of the specific embodiments of the invention that disclosed being used to illustrate the object of the invention here, and this changes and improvements do not constitute deviating from spirit and scope of the invention.
Claims (11)
1, a kind of shock resistance monovinyl aromatic compounds with improved frictional coefficient and anti-airborne dust, it comprises following a and the adulterant of b:
A. from about 95% the High Impact Polystyrene (HIPS) polymkeric substance that polystyrene substrate, contains the rubber separating particles to about 99% weight; And
B. be about 1000～7000 from about 1% its Mn molecular weight to about 5% weight, fusing point is greater than about 100 ℃ High molecular weight polyethylene wax.
2, monovinyl aromatic compounds according to claim 1, wherein, this high molecular wax is polyethylene wax.
3, monovinyl aromatic compounds according to claim 2, wherein, it is less than 1 that this polyethylene wax is pressed the measured penetration number of ASTM D-1321 at 25 ℃.
4, monovinyl aromatic compounds according to claim 3, wherein, the fusing point of this polyethylene wax is greater than 105 ℃, and molecular weight (Mn) is greater than about 2000, and penetration number is served as reasons less than about 0.1 to about 0.5.
5, monovinyl aromatic compounds according to claim 3, wherein the fusing point of this polyethylene wax is about 120 ℃, molecular weight (Mn) is about 2800, and penetration number is less than 0.5.
6, a kind of have high-wearing feature and have separate rubber particulate High Impact Polystyrene (HIPS) compound in polystyrene substrate, this compound also contains the high molecular wax of 5% weight at the most, the Mn molecular weight of this wax is greater than about 2000, and fusing point is greater than about 105 ℃, and penetration number is less than about 1.
7, High Impact Polystyrene (HIPS) compound according to claim 6, wherein, this wax is low molecular weight polyethylene.
8, High Impact Polystyrene (HIPS) compound according to claim 7, wherein, this polyethylene wax is added in this polystyrene with fusion fusion method in screw extrusion press.
9, High Impact Polystyrene (HIPS) compound according to claim 7, wherein, this polyethylene wax is added in this polystyrene compound by adding in the vinylbenzene feed streams that flows to the High Impact Polystyrene (HIPS) reactor.
10, a kind of preparation has the method for the shock resistance monovinyl aromatic compounds of improved frictional coefficient and anti-airborne dust, this method comprises the number-average molecular weight of 5% weight is at the most surpassed about 1000, fusing point surpasses about 100 ℃, and penetration number carries out the fusion fusion less than about 1 high molecular wax and shock resistance monovinyl aromatic compounds.
11, manufacture method according to claim 10, this monovinyl aromatic compounds is the polystyrene that contains separative rubber grain in polystyrene substrate, this wax is that number-average molecular weight surpasses about 2000, fusing point surpasses about 105 ℃, and penetration number is less than about 0.5 low molecular weight polyethylene material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18027094A | 1994-01-12 | 1994-01-12 | |
| US180,270 | 1994-01-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1111252A true CN1111252A (en) | 1995-11-08 |
| CN1086720C CN1086720C (en) | 2002-06-26 |
Family
ID=22659841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95100291A Expired - Fee Related CN1086720C (en) | 1994-01-12 | 1995-01-12 | Monovinyl aromatic compounds having improved abrasion resistance |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0663423B1 (en) |
| JP (1) | JPH07252396A (en) |
| KR (1) | KR100356116B1 (en) |
| CN (1) | CN1086720C (en) |
| CA (1) | CA2140093A1 (en) |
| DE (1) | DE69520607T2 (en) |
| ES (1) | ES2156929T3 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2333377A1 (en) * | 1973-06-30 | 1975-01-23 | Basf Ag | IMPACT-RESISTANT POLYSTYRENE WITH IMPROVED SCRATCH RESISTANCE |
| CS274293B2 (en) * | 1986-05-14 | 1991-04-11 | Montedipe Spa | Reinforced styrene's polymer with impact resistance with improved physico-mechanical properties |
| JPH01108245A (en) * | 1987-10-21 | 1989-04-25 | Kao Corp | Abrasion-resistant resin composition |
-
1995
- 1995-01-12 CN CN95100291A patent/CN1086720C/en not_active Expired - Fee Related
- 1995-01-12 JP JP7019775A patent/JPH07252396A/en active Pending
- 1995-01-12 KR KR1019950000626A patent/KR100356116B1/en not_active IP Right Cessation
- 1995-01-12 CA CA002140093A patent/CA2140093A1/en not_active Abandoned
- 1995-01-12 EP EP95870002A patent/EP0663423B1/en not_active Expired - Lifetime
- 1995-01-12 ES ES95870002T patent/ES2156929T3/en not_active Expired - Lifetime
- 1995-01-12 DE DE69520607T patent/DE69520607T2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE69520607D1 (en) | 2001-05-17 |
| DE69520607T2 (en) | 2001-09-13 |
| KR950032433A (en) | 1995-12-20 |
| JPH07252396A (en) | 1995-10-03 |
| EP0663423B1 (en) | 2001-04-11 |
| CN1086720C (en) | 2002-06-26 |
| ES2156929T3 (en) | 2001-08-01 |
| CA2140093A1 (en) | 1995-07-13 |
| EP0663423A1 (en) | 1995-07-19 |
| KR100356116B1 (en) | 2003-02-05 |
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